public override String ToString()
{
StringBuilder result = new StringBuilder();
result.Append("id = ");
result.Append(this.id);
result.Append("\n");
result.Append("name = ");
result.Append(this.name);
result.Append("\n");
result.Append("event types = ");
if (event_types!=null) {
foreach(String e in event_types) {
result.Append(e);
result.Append(" ");
}
}
return result.ToString();
}